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Synthesis and Characterization of Ti-Nb2O5 Catalysts for Discoloration Reaction of Bromophenol Blue and Indigo Carmine Dyes
Ist Teil von
Topics in catalysis, 2020, Vol.63 (11-14), p.1066-1076
Ort / Verlag
New York: Springer US
Erscheinungsjahr
2020
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
This work investigated the photodegradation of bromophenol blue (BPB) and indigo carmine (IC) dye under UV–Visible light using pure oxides of titanium and niobium, as well as TiO
2
-Nb
2
O
5
oxides containing 0.5, 2.5 and 5 wt% of TiO
2
, prepared by wet impregnation of Nb
2
O
5
with Ti tert-butoxide under inert atmosphere. The results of XRD and Raman spectroscopy showed the presence of anatase TiO
2
phase and T-Nb
2
O
5
phase with orthorhombic structure in the pure TiO
2
and Nb
2
O
5
oxides, respectively. The Nb
2
O
5
oxides doped with TiO
2
presented a T-Nb
2
O
5
phase, but there was no formation of TiNb
2
O
7
. TiO
2
anatase was observed in the mixed oxide with higher Ti content (5 wt% TiO
2
). A zeta potential analysis showed positive surface charge values for titanium oxide and negative for niobium oxide and mixed oxides. The addition of up to 5 wt% of the TiO
2
fold the activity of Nb
2
O
5
in the discoloration of both dyes. Pure TiO
2
exhibits higher initial activity, which could be related to its positive PZC and higher attraction to sulphonic groups present in the dyes. Despite of the lower initial rate, 2.5 and 5% TiNb catalysts achieved full degradation of the dyes after 4 h of reaction.